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- Energy and exergy analysis of co-gasification of crude glycerol and animal fat mixturesPublication . Almeida, Ana; Pilão, Rosa Maria; Ramalho, Elisa; Pinho, CarlosThis work presents an energy and exergy analysis of co-gasification tests of crude glycerol and animal fat mixtures, in order to obtain first and second law efficiencies, the last ones representing a novelty in the field of gasification technology. Mixtures with 5% (w/w) of dry animal fat, 57% (w/w) of dry treated crude glycerol and 38% (w/w) of water were studied in a fixed bed down flow gasification reactor at 800°C and 900°C. The increase of gasification temperature seems not to affect the energy and exergy yields of the overall process.
- Thermodynamic equilibrium modelling of glycerol gasificationPublication . Almeida, Ana; Ramalho, Elisa; Ribeiro, Albina; Pinho, Carlos; Pilão, RosaThe modeling of the gasification process using the thermodynamic chemical equilibrium of the process is an important tool when it is intended to obtain preliminary results or to scale-up an experimental installation. In this work, the gasification process of crude glycerol using steam as the gasification agent was modeled using stoichiometric and non-stoichiometric chemical equi librium models. The effect of the gasification temperature on the equilibrium composition of the producer gas was evaluated. The simulation results were com pared with the experimental results obtained in a downdraft fixed bed reactor. The results obtained showed that the two models predict the equilibrium compo sition in a similar way. They also showed that the gasification reactor is operating under conditions deviating from chemical equilibrium.